testbase: Delete qemu command verbosity
testbase: Delete qemu command verbosity

It's not really useful.

chergert/gnome-continuous,GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io,chergert/gnome-continuous,vrutkovs/vrutkovs.github.io,GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io,chergert/gnome-continuous,GNOME/gnome-ostree